## The Bottom Line: MT4 for Proven EAs and Copy Trading, MT5 for Strategy Development and Multi-Asset
MT4 launched in 2005 and MT5 followed in 2010—but MT5 is not an upgrade of MT4. It is a different platform built on a new architecture. The practical rule: run established EAs and copy-trading signals on MT4, where the ecosystem is deepest; develop your own strategies and trade multiple asset classes on MT5, which is a generation ahead in performance. After 15+ years of coexistence, neither platform forces a migration decision.
## Side-by-Side: The Core Differences at a Glance
| Dimension | MT4 | MT5 |
|———–|—–|—–|
| Release year | 2005 | 2010 |
| Programming language | MQL4 | MQL5 (C++-like) |
| Timeframes | 9 | 21 |
| Pending order types | 4 | 6 (adds Stop Limit orders) |
| Position accounting | Hedging only | Hedging or Netting |
| Backtest engine | Single-threaded, simulated ticks | Multi-threaded, real-tick mode |
| Multi-currency backtesting | No | Yes |
| Built-in economic calendar | No | Yes |
| Market depth (DOM) | No | Yes |
| EA ecosystem | Largest, most commercial EAs | Growing fast |
| Official development | Feature-frozen | Actively updated |
MT5 wins the architecture argument across the board: backtests run 10x faster or more, 21 timeframes cover every analytical need from M1 to MN1, and the built-in economic calendar removes the need for third-party plugins. MT4 counters with the one thing that matters to many users—the largest existing library of commercial EAs and fifteen years of community habits.
## MQL4 vs MQL5: A Generational Leap in Programming
### Syntax and Architecture
MQL5 reads like modern C++: object-oriented classes, a standard library, and clean event callbacks such as OnTick and OnTrade. MQL4 is a procedural language built around global variables and legacy order functions like OrderSend and OrderSelect. Anyone with a programming background will ship reliable code faster in MQL5, and long-term maintenance is far less painful.
### The Compatibility Problem
MT4 EAs do not run on MT5 without conversion. This single friction point explains why so many traders stay put—commercial EA licenses are platform-bound, and migrating bespoke strategies costs development hours. The gap is narrowing: the MQL5 community hosts well over 10,000 free code examples, and the mainstream strategy families (grid, MA cross, breakout, and their martingale variants) all have MT5 ports. Niche commercial EAs are the exception—ask the vendor before you commit.
### EA Resources Compared
| Resource Type | MT4 | MT5 |
|————–|—–|—–|
| Official free code base | Extensive (15 years of accumulation) | 10,000+ examples |
| Commercial EA marketplace | Largest worldwide | Growing |
| Forum activity | High | High (officially promoted) |
| Porting difficulty | — | Easy for grid/MA systems, moderate for complex logic |
## The Backtest Engine: Where MT5 Leaves MT4 Behind
### Speed and Accuracy Together
MT5’s strategy tester parallelizes across every CPU core; backtesting the same strategy over ten years of M15 data routinely runs 10x faster than on MT4. Accuracy improves even more dramatically: MT5’s “Every tick based on real ticks” mode replays genuine historical tick data from your broker, while MT4 interpolates simulated ticks from M1 bars. Backtests that look beautiful on MT4 often shrink when re-run on real ticks—that discrepancy is simulated-tick distortion, and it is exactly the kind of silent bias that kills live accounts.
### Multi-Currency Portfolio Backtesting
MT5 can backtest a strategy trading several instruments at once—say an XAUUSD plus EURUSD combo—with each symbol’s spread and swap handled automatically. MT4 backtests one chart symbol at a time. For portfolio strategies and rotation systems, this capability alone justifies the switch.
### What It Means for Quants
Backtest fidelity determines how predictable your live results will be. If you develop strategies seriously, re-validate every MT4 backtest conclusion on MT5 with real ticks before risking capital—the exercise routinely exposes overfitting that single-threaded, simulated-tick testing hides.
## Order Types and Execution: Small Details, Real Consequences
### Two Extra Pending Orders
MT4 offers four pending order types: Buy Limit, Sell Limit, Buy Stop, Sell Stop. MT5 adds Buy Stop Limit and Sell Stop Limit—a two-stage condition that fills on a pullback after a breakout. Breakout-retracement traders get this natively on MT5; on MT4 you would have to code the logic into an EA.
### Hedging vs Netting Accounts
MT5 accounts come in two accounting modes. Hedging behaves exactly like MT4 and suits retail traders; Netting consolidates positions per symbol, exchange-style, and suits portfolio managers. Open an MT5 hedging account by default unless you specifically need netting—otherwise opposing positions on the same symbol will be merged automatically.
### Built-In Extras
MT5 ships with an economic calendar, market depth (DOM), and integrated MQL5 community access, and its instrument list extends to stocks, futures, and options. MT4’s counterargument is simplicity and footprint: a 1GB VPS runs MT4 comfortably, while MT5 wants at least 2GB for long unattended sessions.
## MT4 and MT5 on ECMarkets
ECMarkets supports both MT4 and MT5 with shared account infrastructure; XAUUSD, major pairs, and CFDs trade on either platform. Copy traders should simply match their signal provider’s platform to minimize cross-platform latency. For a deeper dive into evaluating providers, see our guide on filtering MT4 copy-trading signal sources, and if you are still choosing a broker, our account-opening walkthrough covers platform downloads step by step.
## Which Platform for Which Trader: The Decision Table
| Trader Profile | Recommended Platform | Why |
|—————|———————|—–|
| Manual trading beginner | MT4 | Simplest interface, most tutorials |
| Commercial EA user | MT4 | Largest EA marketplace, instant licensing |
| Copy trader | Follow the signal source | Match the provider’s platform |
| Strategy developer | MT5 | Real-tick backtests, multi-threaded speed |
| Portfolio / multi-symbol systems | MT5 | Multi-currency backtesting, netting mode |
| Multi-asset trader | MT5 | Stocks, futures, options coverage |
| Low-spec VPS, long uptime | MT4 | Lower resource footprint |
### The Pragmatic Play: Run Both
Most experienced traders run both platforms in parallel—MT4 carries the validated EA lineup for daily execution, while MT5 handles research, backtesting, and multi-timeframe analysis. Keeping the accounts separate also makes performance attribution cleaner. Remember: the platform is a tool. Expectancy and risk control decide your P&L, not the terminal.
## Frequently Asked Questions
### Can you run MT4 and MT5 at the same time?
Yes. MT4 and MT5 are separate applications with distinct data folders and instance IDs, so they run side by side on the same machine without interference. Most brokers—including ECMarkets—offer both platforms, and you can hold accounts on each simultaneously. A common workflow: run proven EAs on MT4 while prototyping new strategies and trading multi-asset instruments on MT5. They complement rather than replace each other.
### Do MT4 EAs work on MT5?
Not directly. MT4 uses MQL4 while MT5 uses MQL5, and the two languages differ in syntax and event architecture, so an EA must be rewritten or converted before it compiles on MT5. Per the MetaQuotes community, the MQL5 code base already hosts thousands of ports of classic MT4 EAs—grid, moving average, and breakout strategies are well covered—but commercial EAs require the developer’s MT5 license, so confirm before switching.
### Why is MT5 backtesting so much faster than MT4?
The MT5 strategy tester uses multi-threaded, distributed computation that taps every CPU core, while MT4 backtesting is essentially single-threaded. MT5 also offers the ‘Every tick based on real ticks’ mode using genuine historical tick data—far more accurate than MT4’s simulated ticks interpolated from M1 bars. In practice, backtesting the same strategy over 10 years runs 10x faster or more on MT5. MT5 additionally supports multi-currency portfolio backtesting, which MT4 simply cannot do.
### Should gold (XAUUSD) traders use MT4 or MT5?
For discretionary XAUUSD trading, the experience is similar—MT4 is simpler, MT5 offers more instruments and 21 timeframes versus 9. The real difference is quantitative: if you run established EAs, MT4’s ecosystem is unbeatable; if you develop your own strategies and need accurate backtests, MT5 is clearly superior. Copy traders should match whatever platform their signal provider uses to avoid cross-platform latency.
### Is MT4 being phased out? Is it still worth learning?
Not in the foreseeable future. MetaQuotes has frozen MT4 feature development, yet MT4 remains the most installed retail forex platform worldwide, and the sheer size of its EA ecosystem guarantees longevity. Practical advice: manual and copy traders are fine on MT4; aspiring quant developers should learn MQL5 directly—it is the officially supported, more modern language with the lowest future migration cost. Since both platforms share nearly identical interfaces, switching costs are minimal.
—
*Author: Dongyi Finance | Focused on XAUUSD quantitative trading and strategy sharing*
*For discussions, reach out via:*
– *Telegram: @DongyiTrade*
